DingoPDM
DingoPDM is an Infineon Profet based Power Distribution Module.
Goals
- Learn more about PDMs and high DC current devices
- Learn about developing firmware for a more complex STM32 based project
- Create a low cost device that my friends and I can use in our project cars
- Layout the board to fit simple case designs
- 3D printed top shell and flat aluminum heatsinks (no machining)
- Use low cost 1oz/0.5oz 4 layer PCBs (low cost 2oz/1oz now available from JLCPCB)
- Share my work with others for reference, inspiration or collaboration.
If this project does help you in any way, I'd appreciate a message!
Disclaimer
This is a personal hobby project. I am not a professional. Use at your own risk.
Hardware
- 2x Profet BTS7002-1EPP
- 2x 14A outputs
- With flyback diodes
- 3x Profet BTS7008-2EPA
- 6x 8A outputs
- 2x Digital Inputs
- STM32F446RET6 Microcontroller
- 256Kbit FRAM
- Settings storage
- CAN transceiver
- No terminating resistor
- Board temperature measured using MCP9808
- 2x LEDs for power and temperature status
- 2x LEDs for status
- Onboard 12V to 5V to 3.3V regulation
- 2x M6 lug 12V power connection
- 12V voltage measurement
- THT test pads for easy connection of logic analyzer (ex: Saleae leads)
- Deutsch DT 12 pin connector
Connections
| Pin | Function | Current |
|---|---|---|
| 1 | CAN L | |
| 2 | CAN H | |
| 3 | Output 8 | 8A |
| 4 | Output 7 | 8A |
| 5 | Output 6 | 8A |
| 6 | Output 5 | 8A |
| 7 | Output 1 | 14A |
| 8 | Input 1 | |
| 9 | Output 4 | 8A |
| 10 | Output 3 | 8A |
| 11 | Input 2 | |
| 12 | Output 2 | 14A |
Open Items
- Test V7.1 thermal performance
Design Notes
- Prior to V6, the design had a lot of features which meant a lot of parts
- To make the board cheaper, easier to source/produce and quicker to test the design was drastically simplified
- The Deutsch DT connector was selected due to it's popularity, part availability and ease of use
- BTS724 was used on V6, but removed for V7 due to thermal issues. It wouldn't trip until a very high current.
Case
V7 Case/Heatsink design
- 3D Printed Case
- Flat aluminum heatsink plate
- Flat aluminum baseplate
- The heatsink is designed to be 2 pieces. A heatsink plate and a baseplate
- The heatsink plate provides clearance for the THT pins of the Deutsch connectors and the RedCube terminal while getting as close to the Profets as possible
- Note: the heatsink plate should be covered on both sides with a thermal pad material to electricaly isolate the heatsink while still providing a thermal interface (I use 3M 5583S)
- The baseplate holds the case and also sandwiches the spacer plate to the PCB
Photos
Some various photos of different versions
